Welcome to the Winobloggers webpage! Students and professors from different universities meet to discuss their findings on Winogradsky columns they constructed!
We learn how to formulate hypotheses, observe, comment, ask and reply to questions related to our scientific experiments.

Between the 6th
and 7th week, we couldn’t descry any obvious difference.

The growth of the purple sulfur bacteria in the middle zone is still more
visible in the control column than in the warmth-exposed column.During photosynthesis, unlike cyanobacteria or plants, they bind sulfur
from the bottom of the column producing hydrogen sulfide, rather than oxygen.
Thus, the purple sulfur bacteria cause anoxic conditions in the middle zone
they grow.

In both columns,
is still observed the presence of biofilms, the concentration of which, is
greater in the first column.

This
gradual distinction in the zones of the column, starting with the display of
sulphates purple bacteria, has only been observed in the control column, even
after 7 weeks. Thus, it can be assumed that the growth rate of the bacteria in
the 2nd column, is considerably slower, as zoning hasn’t been
observed yet. This fact is probably due to the rapid fluctuation of temperature.
In the warmth-exposed column, this affects the bacteria directly by limiting
the growth of the non-resistant ones at high temperatures. Also, the bacteria
in this column, in order to get protected from the temperature fluctuation,
could form spores, which means a static metabolic condition. Rather than that, the
overheating of the plastic bottle can excrete damaging chemicals for the
bacteria.

Hypothesis: The rapid fluctuation of the temperature on daily basis, reduces the
growth rate of the microorganisms in the 2nd Winogradsky column